1231501152501 has 6 divisors (see below), whose sum is σ = 1778834998070. Its totient is φ = 821000768328.

The previous prime is 1231501152493. The next prime is 1231501152523. The reversal of 1231501152501 is 1052511051321.

It is a happy number.

1231501152501 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 5 + 0 + 1 + 152 + 501 = 666.

It can be written as a sum of positive squares in only one way, i.e., 699228767601 + 532272384900 = 836199^2 + 729570^2 .

It is not a de Polignac number, because 1231501152501 - 2³ = 1231501152493 is a prime.

It is a super-2 number, since 2×1231501152501² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231501152701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68416730686 + ... + 68416730703.

Almost surely, 2^{1231501152501} is an apocalyptic number.

It is an amenable number.

1231501152501 is a deficient number, since it is larger than the sum of its proper divisors (547333845569).

1231501152501 is a wasteful number, since it uses less digits than its factorization.

1231501152501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136833461395 (or 136833461392 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

The spelling of 1231501152501 in words is "one trillion, two hundred thirty-one billion, five hundred one million, one hundred fifty-two thousand, five hundred one".